Polyester process
CA 1114995 A · Owner: Monsanto Company · Inventors: Knox, Walter R.; Hill, James C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for the production of a polyester having an acid number which is not greater than 65 which comprises reacting an acid anhydride with a monoterminal epoxide in such a way that a self-sustaining reaction is initiated within 200 seconds of the reactants being mixed together and said reaction results in the attainment of a maximum temperature in excess of 200°C within 200 seconds of initiation.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 22, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 22, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.